TWI661232B - Integrated structure of flood illuminator and dot projector - Google Patents

Abstract

The invention provides an integrated structure of a flood light illuminator and a dot matrix projector, which includes a light source emitter, a collimator, located at a front end of the light source emitter, and a composite lens located at the light source emitter. In the front end, the composite lens includes a diffractive optical element and a diffuser, and a switching device connected to the switching lens to control the diffractive optical element or the diffusion of the composite lens. The mirror is aligned with the position of the light source emitter.

Description

Integrated structure of flood light illuminator and dot matrix projector

The invention relates to the field of optics, in particular to an integrated structure of a flood light illuminator and a dot matrix projector.

With the advancement of science and technology, mobile phones have become one of the indispensable carry-on items for modern people, so the protection technology of personal mobile phone data has also been continuously researched and developed.

In recent years, with the development of 3D stereo image sensing technology, electronic products with face recognition functions have gradually appeared on the market. Taking a mobile phone as an example, existing mobile phones with a face recognition function include at least a flood light illuminator, a dot matrix projector, and an infrared lens. The process of learning face recognition by a mobile phone generally includes three steps in order: proximity sensing (determining whether an object is close to the mobile phone), flood light illuminator sensing, and dot-matrix projector sensing. It is worth noting that the sensing method of the flood light irradiator includes emitting a light source (such as infrared light) with a larger irradiation angle through the flood light irradiator, projecting onto a surface of an object (such as a human face), and then using infrared light The camera receives the light source reflected from the object, and after calculating through the processor and other components, it roughly determines whether the object is a human face. When it is determined that the object is a human face, the dot matrix projector emits multiple light points (for example, thousands to tens of thousands) to project onto the human face, and the infrared light lens is used to receive the reflected light point changes to calculate the virtual face surface contour. For fine judgment Whether the detected face is the user of the phone or another authenticated person.

However, the flood projector and the dot matrix projector are two different components, but they also include a light source transmitter. Therefore, if the flood projector and dot matrix projector can be integrated, the production cost of the mobile phone can be reduced, and the mobile phone can be increased. Hardware configuration space.

The invention provides an integrated structure of a flood light illuminator and a dot matrix projector, which includes a light source emitter, a collimator, located at a front end of the light source emitter, and a composite lens located at the light source emitter. In the front end, the composite lens includes a diffractive optical element and a diffuser, and a switching device connected to the switching lens to control the diffractive optical element or the diffusion of the composite lens. The mirror is aligned with the position of the light source emitter.

Because the flood light emitter and the dot matrix projector have some similar functions, for example, both include a light source emitter and a collimator, and during the face recognition process of the mobile phone, the flood light emitter and the dot matrix projector It will not be used at the same time. Therefore, the present invention is characterized in that both the flood light emitter and the dot matrix projector are integrated into a structure, and the mode of the integrated structure is changed by switching the device. In this way, the same structure can be used as a flood light emitter or a dot matrix projector, respectively. The same integrated structure can replace the two different components of the original flood light emitter and the dot matrix projector, reducing the production cost of the mobile phone and increasing Phone hardware configuration space.

1‧‧‧ integrated structure

10‧‧‧ light source emitter

12‧‧‧ light source

14‧‧‧ Collimator

16‧‧‧ compound lens

18‧‧‧ diffuser

20‧‧‧ Diffractive Optical Element

22‧‧‧ Switching device

FIG. 1 is a schematic cross-sectional view showing an integrated structure of a flood light illuminator and a dot matrix projector according to the present invention.

FIG. 2 is a schematic top view illustrating when the integrated structure of the flood light illuminator and the dot matrix projector of the present invention is in a flood light irradiator mode.

FIG. 3 is a schematic top view illustrating when the integrated structure of the flood light illuminator and the dot matrix projector of the present invention is in a dot matrix projector mode.

In order to make a person skilled in the art who is familiar with the technical field of the present invention further understand the present invention, the preferred embodiments of the present invention are enumerated below, and in conjunction with the accompanying drawings, the constitutional content of the present invention and the desired effects are described in detail .

For the convenience of description, the drawings of the present invention are only for illustration to make it easier to understand the present invention, and the detailed proportions thereof can be adjusted according to design requirements. As described in the text, for the relative relationship between the relative elements in the figure, everyone in the art should understand that it refers to the relative position of the object, so they can be reversed to show the same component, which should all belong to this specification. The scope of the disclosure is described here first.

Please refer to FIG. 1, which is a schematic cross-sectional view illustrating an integrated structure of a flood light illuminator and a dot matrix projector of the present invention. As shown in FIG. 1, the integrated structure 1 of the present invention includes a light source emitter 10. Here, the direction from which the light source emitter emits light sources (such as visible light, infrared, etc.) is defined as a front end (such as the + Y direction in the first figure). A light source 12 is emitted from the light source transmitter 10 toward the front end direction, a collimator 14 and a composite lens 16 are disposed along the front end direction, and are located on the path of the light source 12. That is, after the light source 12 is emitted by the light source emitter 10, it will pass through a collimator 14 and a composite lens 16 in this order. The light source 12 is preferably laser light, but it is not limited to this. The main function of the collimator lens 14 is to converge light originally emitted in different directions into parallel light. The function of the composite lens 16 will be described in the following paragraphs.

Regarding the composite lens 16, please refer to FIG. 2 and FIG. 3. FIG. 2 shows a schematic top view when the integrated structure of the flood light illuminator and the dot matrix projector of the present invention is in a flood light illuminator mode. The figure shows a schematic top view when the integrated structure of the flood light illuminator and the dot matrix projector of the present invention is in a dot matrix projector mode. As shown in FIG. 2, the composite lens 16 includes a diffuser (Diffuser) 18 and a diffractive optical element (DOE) 20. In this embodiment, both the diffusion mirror 18 and the diffractive optical element 20 are located on the same plane, and the composite lens 16 is connected to a switching device 22. The switching device is turned on or off to move the composite lens 16 along the plane. The positions make the diffuser 18 or the diffractive optical element 20 align with the passing path of the light source 12 respectively.

In more detail, taking this embodiment as an example, in a preset state, the diffuser 18 of the composite lens 16 is located on the passing path of the light source 12, that is, in the preset state, the light source 12 passes through the collimator lens 14. After that, it will pass through the diffuser 18 and will not pass through the diffractive optical element 20. The composite lens 16 includes a switching device 22. The switching device 22 is, for example, various electronically controlled switches connected to a control module such as a processor of a mobile phone. For example, a signal sent from a processor in a mobile phone can control the switching device 22 to change the position of the composite lens 16. As shown in FIG. 3, when the switching device 22 is activated by applying a current, the position of the composite lens 16 is also changed. At this time, the diffractive optical element 20 will be located on the passing path of the light source 12, that is, after the light source passes through the collimator lens 14, it will pass through the diffractive optical element 20, and the diffuser 18 of the composite lens 16 It is no longer on the path of the light source 12. According to the applicant's experimental results, the power required to activate the switching device 22 is extremely small, less than about 60 milliamperes (mA). In addition, the switching device 22 further includes an automatic return device, such as a magnetic suction device or a spring device. When the power supply to the switching device 22 is stopped, the switching device 22 will help the composite lens 16 return to a preset position (for example, the first 2), without consuming additional power.

In the present invention, the integrated structure 1 includes a flood light irradiator mode and a dot matrix projector mode. formula. In more detail, when the integrated structure 1 is in a flood light irradiator mode, that is, the state shown in FIG. 2, it has the function of a flood light irradiator. On the other hand, in the dot matrix projector mode, that is, in the state shown in FIG. 3, it has the function of a dot matrix projector. In practical applications, this embodiment is taken as an example to explain that when an approaching sensor (not shown) in a mobile phone detects an object approaching, the integrated structure 1 activates a flood light irradiator mode, as shown in FIG. 2 It is shown that, in a preset state, when the parallel laser light (that is, the light source 12 after passing through the collimator lens 14) passes through the diffuser mirror 18, the light source 12 will diverge in different directions. In other words, when the light source 12 of the light source emitter 10 passes through the diffuser 18, a light source with a large area irradiation angle will be generated. The combined structure of the light source emitter 10, the collimator mirror 14, and the diffuser mirror 18 can be used as a flood light irradiator. After determining that the object close to the mobile phone is a human face, the subsequent integrated structure 1 will activate the dot matrix projector mode, that is, as shown in FIG. 3, the switching device 22 is activated to change the position of the composite lens 16 so that the diffractive optical element 20 Located on the path of the light source 12, when the parallel laser light (that is, the light source 12 after passing through the collimator lens 14) passes through the diffractive optical element 20, a plurality of (for example, thousands or tens of thousands) light spots will be generated. In other words, at this time, the combined structure of the light source emitter 10, the collimator lens 14, and the diffractive optical element 20 can be regarded as a dot matrix projector. In the subsequent steps, the light spots are projected on the human face and reflected, and the infrared light lens is used to receive the reflected light spot changes to calculate the virtual face contour and compare it with the certified face information.

Because the flood light emitter and the dot matrix projector have some similar functions, for example, both include a light source emitter and a collimator, and during the face recognition process of the mobile phone, the flood light emitter and the dot matrix projector It will not be used at the same time. Therefore, the present invention is characterized in that both the flood light emitter and the dot matrix projector are integrated into a structure, and the mode of the integrated structure is changed by switching the device. In this way, the same structure can be used as a flood light emitter or a dot matrix projector, respectively. The same integrated structure can replace the two different components of the original flood light emitter and the dot matrix projector, reducing the production cost of the mobile phone and increasing Phone hardware configuration space. The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

Claims (9)

An integrated structure of a flood illuminator and a dot projector includes: a light source emitter; a collimator located at a front direction of the light source emitter; a composite lens , Located at the front direction of the light source emitter, wherein the composite lens includes a diffractive optical element (Diffractive Optical Elements) and a diffuser (Diffuser), and the collimator lens is located between the light source emitter and the composite lens And a switching device connected to the switching lens to control the position of the diffractive optical element or the diffuser of the composite lens at the light source emitter. According to the integrated structure of the flood light illuminator and the dot matrix projector according to item 1 of the scope of the patent application, the diffractive optical element and the diffuser of the switching lens are located on the same plane. According to the integrated structure of the flood light illuminator and the dot-matrix projector described in item 1 of the scope of the patent application, it further includes a control module, and the switching device is connected to the control module. The integrated structure of the flood light illuminator and the dot matrix projector according to item 1 of the patent application scope, wherein the integrated structure of the flood light illuminator and the dot matrix projector includes a flood light irradiator mode and a dot matrix projector mode . The integrated structure of a flood light illuminator and a dot matrix projector according to item 4 of the scope of application for a patent, wherein when the diffractive optical element is located at the positive front end of the light source emitter, the flood light illuminator and dot matrix projection The integrated structure of the projector is in this dot matrix projector mode. The integrated structure of the flood light illuminator and the dot matrix projector as described in item 4 of the patent application scope, wherein when the diffuser is located at the front end of the light source emitter, the flood light irradiator is integrated with the dot matrix projector. The structure is in this flood light mode. According to the integrated structure of the flood light illuminator and the dot matrix projector according to item 1 of the scope of the patent application, the collimator lens is located between the light source emitter and the composite lens. According to the integrated structure of the flood light illuminator and the dot matrix projector as described in the first item of the patent application scope, wherein the light source emitter emits a laser light toward the front end direction. According to the integrated structure of the flood light illuminator and the dot matrix projector according to item 1 of the scope of the patent application, the switching device further includes an automatic return device.